IDEXX LABORATORIES INC /DE
8-A12G/A, 1999-07-30
IN VITRO & IN VIVO DIAGNOSTIC SUBSTANCES
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<PAGE>   1
                       SECURITIES AND EXCHANGE COMMISSION
                             Washington, D.C. 20549

                                   Form 8-A/A
                                 AMENDMENT NO. 1

                FOR REGISTRATION OF CERTAIN CLASSES OF SECURITIES
                     PURSUANT TO SECTION 12(b) OR (g) OF THE
                         SECURITIES EXCHANGE ACT OF 1934


                            IDEXX LABORATORIES, INC.
             ------------------------------------------------------
             (Exact name of registrant as specified in its charter)


             Delaware                                    01-0393723
     -----------------------                         -------------------
     (State of incorporation                         (IRS Employer
         or organization)                            Identification No.)


     One Idexx Drive, Westbrook, ME                      04092
- ----------------------------------------               ----------
(Address of principal executive offices)               (Zip Code)


If this Form relates to the registration of a class of securities pursuant to
Section 12(b) of the Exchange Act and is effective pursuant to General
Instruction A.(c), please check the following box. [ ]

If this Form relates to the registration of a class of securities pursuant to
Section 12(g) of the Exchange Act and is effective pursuant to General
Instruction A.(d), please check the following box. [ ]

Securities Act registration statement number to which this form
relates:
          -----------------------
              (If applicable)

Securities to be registered pursuant to Section 12(b) of the Act: None

Securities to be registered pursuant to Section 12(g) of the Act:


                         Preferred Stock Purchase Rights
                    -----------------------------------------
                    (Title of each class to be so registered)


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<PAGE>   2


Explanatory Note:

     This Amendment No. 1 to Registration Statement on Form 8-A/A amends and
restates the Registration Statement on Form 8-A dated December 24, 1996 (the
"Form 8-A"), filed by IDEXX Laboratories, Inc. (the "Company") with respect to
the Preferred Stock Purchase Rights (the "Rights") issued pursuant to the Rights
Agreement dated as of December 17, 1996 between the Company and BankBoston, N.A.
(formerly known as The First National Bank of Boston), as Rights Agent (the
"Rights Agent"). On July 22, 1999, the Company and the Rights Agent entered into
Amendment No. 1 to Rights Agreement ("Amendment No. 1"), which is included as
Exhibit 2 hereto and is incorporated herein by reference. Amendment No. 1
amended the Rights Agreement to: (i) eliminate provisions related to "Continuing
Directors," (ii) eliminate provisions related to "Permitted Offers," and (iii)
make certain other revisions. The Rights Agreement, as amended through the date
hereof, is referred to herein as the "Rights Agreement."

Item 1.   Description of Registrant's Securities to be Registered.

     On December 17, 1996, the Board of Directors of the Company, declared a
dividend of one preferred stock purchase right (a "Right") for each outstanding
share of the Company's Common Stock to stockholders of record at the close of
business on December 30, 1996 (the "Record Date"). Each Right entitles the
registered holder to purchase from the Company a unit consisting of one
one-thousandth of a share (a "Unit") of Series A Junior Participating Preferred
Stock, $1.00 par value per share (the "Preferred Stock"), at a purchase price of
$200.00 in cash per Unit (the "Purchase Price"), subject to adjustment. The
description and terms of the Rights are set forth in the Rights Agreement dated
as of December 17, 1996 between the Company and BankBoston, N.A. (formerly known
as The First National Bank of Boston), as amended on July 22, 1999.

     Initially, the Rights will be attached to all Common Stock certificates
representing shares then outstanding, and no separate Rights Certificates will
be distributed. The Rights will separate from the Common Stock and a
Distribution Date will occur upon the earlier of (i) ten business days (or such
later date as may be determined by the Board of Directors of the Company)
following a public announcement that a person or group of affiliated or
associated persons (an "Acquiring Person") has acquired, or obtained the right
to acquire, beneficial ownership of 20% or more of the outstanding shares of
Common Stock (the "Stock Acquisition Date"), or (ii) ten business days (or such
later date as may be determined by the Board of Directors of the Company)
following the commencement of a tender offer or exchange offer that


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<PAGE>   3


would result in a person or group beneficially owning 30% or more of such
outstanding shares of Common Stock. Until the Distribution Date (or earlier
redemption or expiration of the rights), (i) the Rights will be evidenced by the
Common Stock certificates and will be transferred with and only with such Common
Stock certificates, (ii) new Common Stock certificates issued after the Record
Date will contain a notation incorporating the Rights Agreement by reference and
(iii) the surrender for transfer of any certificates for Common Stock
outstanding, even without such notation, will also constitute the transfer of
the Rights associated with the Common Stock represented by such certificate.

     The Rights are not exercisable until the Distribution Date and will expire
upon the earliest of the close of business on December 30, 2006 (the "Final
Expiration Date") or the redemption or exchange of the Rights as described
below.

     As soon as practicable after the Distribution Date, separate certificates
evidencing the Rights ("Rights Certificates") will be mailed to holders of
record of the Common Stock as of the close of business on the Distribution Date
and, thereafter, such separate Rights Certificates alone will represent the
Rights. Except as otherwise determined by the Board of Directors and except in
connection with shares of Common Stock issued upon the exercise of employee
stock options, issuances under other employee stock benefit plans or the
conversion of convertible securities issued hereafter, only shares of Common
Stock issued prior to the Distribution Date will be issued with Rights.

     In the event that any Person becomes an Acquiring Person then, promptly
following the first occurrence of such event, proper provision shall be made so
that each holder of a Right (except as provided below and in Section 7(e) of the
Rights Agreement) shall thereafter have the right to receive, upon exercise
thereof at the then current Purchase Price, in lieu of a number of one
one-thousandths of a share of Preferred Stock, such number of shares of Common
Stock of the Company that equals the result obtained by (x) multiplying the then
current Purchase Price by the then number of one one-thousandths of a share of
Preferred Stock for which a Right is then exercisable, and (y) dividing that
product by 50% of the current market price per share of Common Stock on the date
of such first occurrence. Notwithstanding any of the foregoing, following the
occurrence of the event set forth in this paragraph, all Rights that are, or
(under certain circumstances specified in the Rights Agreement) were,
beneficially owned by any Acquiring Person will be null and void. The event
summarized in this paragraph is referred to as "Section 11(a)(ii) Event."

     In the event that, at any time after any Person becomes an Acquiring
Person, (i) the Company is acquired in a merger or other business combination
transaction in which the Company is not the surviving corporation or its Common
Stock is changed or exchanged, or (ii) 50% or more of the Company's assets or
earning power is sold or


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<PAGE>   4


transferred, each holder of a Right (except Rights which previously have been
voided as set forth above) shall thereafter have the right to receive, upon
exercise, that number of shares of Common Stock of the acquiring company which
equals the exercise price of the Right divided by one-half of the current market
price of such Common Stock at the date of the occurrence of the event. The
events summarized in this paragraph are referred to as "Section 13 Events."
Section 11(a)(ii) Events and Section 13 Events are collectively referred to as
"Triggering Events."

     At any time after the occurrence of a Section 11(a)(ii) Event, subject to
certain conditions, the Board of Directors of the Company may exchange the
Rights (other than Rights owned by such Acquiring Person which have become
void), in whole or in part, at an exchange ratio of one share of Common Stock,
or one one-thousandth of a share of Preferred Stock (or of a share of a class or
series of the Company's preferred stock having equivalent rights, preferences
and privileges), per Right (subject to adjustment).

     The Purchase Price payable, and the number of Units of Preferred Stock or
other securities or property issuable, upon exercise of the Rights are subject
to adjustment from time to time to prevent dilution (i) in the event of a stock
dividend on, or a subdivision, combination or reclassification of, the Preferred
Stock, (ii) if holders of the Preferred Stock are granted certain rights or
warrants to subscribe for Preferred Stock or convertible securities at less than
the then-current market price of the Preferred Stock, or (iii) upon the
distribution to holders of the Preferred Stock of evidences of indebtedness or
assets (excluding regular periodic cash dividends paid out of earnings or
retained earnings) or of subscription rights or warrants (other than those
referred to above).

     The number of Rights associated with each share of Common Stock is also
subject to adjustment in the event of a stock split of the Common Stock or a
stock dividend on the Common Stock payable in Common Stock or subdivisions,
consolidations or combinations of the Common Stock occurring, in any such case,
prior to the Distribution Date.

     Preferred Stock purchasable upon exercise of the Rights will not be
redeemable. Each share of Preferred Stock will be entitled to a minimum
preferential quarterly dividend payment of $10 per share and will be entitled to
an aggregate dividend of 1000 times the dividend declared per share of Common
Stock. In the event of liquidation, the holders of the Preferred Stock will be
entitled to a minimum preferential liquidation payment of $1000 per share and
will be entitled to an aggregate payment of 1000 times the payment made per
share of Common Stock. Each share of Preferred Stock will have 1000 votes,
voting together with the Common Stock. In the event of any merger, consolidation
or other transaction in which Common Stock is exchanged, each share of Preferred
Stock will be entitled to receive 1000 times the amount received per share of
Common Stock. These rights are protected by customary antidilution provisions.

                                       4

<PAGE>   5
     Because of the nature of the Preferred Stock's dividend, liquidation and
voting rights, the value of one one-thousandth of a share of Preferred Stock
purchasable upon exercise of each Right should approximate the value of one
share of Common Stock.

     With certain exceptions, no adjustment in the Purchase Price will be
required until cumulative adjustments amount to at least 1% of the Purchase
Price. No fractional Units will be issued and, in lieu thereof, an adjustment in
cash will be made based on the market price of the Preferred Stock on the last
trading date prior to the date of exercise.

     At any time prior to the earlier of (i) ten business days (or such later
date as may be determined by the Board of Directors of the Company) following
the Stock Acquisition Date or (ii) the Final Expiration Date, the Company may
redeem the Rights in whole, but not in part, at a price of $.01 per Right (the
"Redemption Price"), payable in cash. Immediately upon the action of the Board
of Directors ordering redemption of the Rights, the Rights will terminate and
the only right of the holders of Rights will be to receive the Redemption Price.

     Until a Right is exercised, the holder thereof, as such, will have no
rights as a stockholder of the Company, including, without limitation, the right
to vote or to receive dividends. While the distribution of the Rights will not
be taxable to stockholders or to the Company, stockholders may, depending upon
the circumstances, recognize taxable income in the event that the Rights become
exercisable for Common Stock (or other consideration) of the Company or for
Common Stock of the acquiring company as set forth above.

     Subject to certain exceptions, any of the provisions of the Rights
Agreement may be amended by the Board of Directors of the Company prior to such
time as the Rights are no longer redeemable.

     A copy of the Rights Agreement dated as of December 17, 1996 between the
Company and the Rights Agent, which includes as Exhibit A, the Form of
Certificate of Designations and as Exhibit B, the Form of Rights Certificate, is
filed as Exhibit 1 to the Form 8-A and is incorporated herein by reference.
Amendment No. 1 is filed as Exhibit 2 hereto and is incorporated herein by
reference. The foregoing description of the Rights Agreement and the Rights does
not purport to be complete and is qualified in its entirety by reference to such
Exhibits.

Item 2.   Exhibits.

1              Rights Agreement dated as of December 17, 1996 between the
               Company and BankBoston, N.A. (formerly known as The First
               National Bank of

                                       5

<PAGE>   6


               Boston) is incorporated herein by reference to Exhibit 1 to
               the Company's Registration Statement on Form 8-A (File No.
               000-19271)

2              Amendment No. 1 to Rights Agreement dated as of July 22, 1999
               between the Company and BankBoston, N.A. (formerly known as The
               First National Bank of Boston)

                                       6

<PAGE>   7


                                    SIGNATURE


     Pursuant to the requirements of Section 12 of the Securities Exchange Act
of 1934, the Registrant has duly caused this Amendment No. 1 to Registration
Statement to be signed on its behalf by the undersigned, thereto duly
authorized.


                                            IDEXX LABORATORIES, INC.



Date: July 30, 1999                    By: /s/ Ralph K. Carlton
                                           __________________________
                                           Ralph K. Carlton
                                           Senior Vice President
                                           Finance and Administration



                                       7
<PAGE>   8


                                  EXHIBIT INDEX


Exhibit No.                          Description

1         Rights Agreement dated as of December 17, 1996 between the Company and
          BankBoston, N.A. (formerly known as The First National Bank of Boston)
          is incorporated herein by reference to Exhibit 1 to the Company's
          Registration Statement on Form 8-A (File No. 000-19271)

2         Amendment No. 1 to Rights Agreement dated as of July 22, 1999 between
          the Company and BankBoston, N.A. (formerly known as The First National
          Bank of Boston)


                                       8

<PAGE>   1
                                                                       EXHIBIT 2


                                 AMENDMENT NO. 1
                                       TO
                                RIGHTS AGREEMENT


     This AMENDMENT NO. 1 (the "Amendment") to the Rights Agreement (the "Rights
Agreement") dated as of December 17, 1996 between IDEXX Laboratories, Inc., a
Delaware corporation (the "Company"), and BankBoston, N.A. (formerly known as
The First National Bank of Boston), a national banking association, as Rights
Agent (the "Rights Agent"), is entered into as of the 22nd day of July, 1999.
Capitalized terms not otherwise defined herein shall have the respective
meanings given to them in the Rights Agreement.


                                    RECITALS

     WHEREAS, the Board of Directors has determined that it is in the best
interests of the Company to amend the Rights Agreement as set forth herein.

     WHEREAS, the Company has requested that the Rights Agreement be amended in
accordance with Section 27 of the Rights Agreement, as set forth herein, and the
Rights Agent is willing to amend the Rights Agreement as set forth herein.


                                   AGREEMENT

     NOW, THEREFORE, the parties, intending to be legally bound, hereby agree as
follows:

1.   Sections 1(d)(ii) and 1(d)(iii) of the Rights Agreement are hereby amended
     and restated to read in their entirety as follows:

     "(ii)     which such Person or any of such Person's Affiliates or
               Associates, directly or indirectly, has the right to vote or
               dispose of or has "Beneficial Ownership" of (as determined
               pursuant to Rule 13d-3 of the General Rules and Regulations under
               the Exchange Act, or any comparable or successor rule), including
               pursuant to any agreement, arrangement or understanding (other
               than customary agreements with and between underwriters and
               selling group members with respect to a bona fide public offering
               of securities), whether or not in writing; PROVIDED, HOWEVER,
               that a Person shall not be deemed the "Beneficial Owner" of, or
               to "Beneficially Own," any security under this subparagraph (ii)
               as a result of an agreement, arrangement or understanding to vote
               such security if such agreement, arrangement or understanding:
               (A) arises solely from a revocable proxy or consent given in
               response to a public proxy or consent solicitation made pursuant
               to, and in accordance with, the applicable provisions of the
               General Rules and Regulations under the Exchange Act, and (B) is
               not then reportable by such Person on Schedule 13D under the
               Exchange Act (or any comparable or successor report); or

<PAGE>   2
     (iii)     which are beneficially owned, directly or indirectly, by any
               other Person (or any Affiliate or Associate thereof) with which
               such Person (or any of such Person's Affiliates or Associates)
               has any agreement, arrangement or understanding (other than
               customary agreements with and between underwriters and selling
               group members with respect to a bona fide public offering of
               securities), whether or not in writing, for the purpose of
               acquiring, holding, voting (except pursuant to a revocable proxy
               or consent as described in the proviso to subparagraph (ii) of
               this paragraph (d)) or disposing of any voting securities of the
               Company."

2.   Section 1(i) of the Rights Agreement is hereby deleted in its entirety and
     replaced with the following:

               "(i)     [Intentionally omitted.]"

3.   Section 1(p) of the Rights Agreement is hereby deleted in its entirety and
     replaced with the following:

               "(p)     [Intentionally omitted.]"

4.   The penultimate sentence of Section 3(a) of the Rights Agreement is hereby
     amended and restated to read in its entirety as follows:

     "In the event that an adjustment in the number of Rights per share of
     Common Stock has been made pursuant to Sections 11(i) or 11(p) hereof, at
     the time of distribution of the Right Certificates, the Company shall make
     the necessary and appropriate rounding adjustments (in accordance with
     Section 14(a) hereof) so that Rights Certificates representing only whole
     numbers of Rights are distributed and cash is paid in lieu of any
     fractional Rights."

5.   Section 4(b) of the Rights Agreement is hereby amended and restated to read
     in its entirety as follows:

               "(b) Any Rights Certificate issued pursuant to Section 3,
     Section 11(i) or Section 22 hereof that represents Rights beneficially
     owned by persons known to be: (i) an Acquiring Person or any Associate or
     Affiliate of an Acquiring Person, (ii) a transferee of an Acquiring Person
     (or of any such Associate or Affiliate) who becomes a transferee after the
     Acquiring Person becomes such, or (iii) a transferee of an Acquiring Person
     (or of any such Associate or Affiliate) who becomes a transferee prior to
     or concurrently with the Acquiring Person becoming such and receives such
     Rights pursuant to either (A) a transfer (whether or not for consideration)
     from the Acquiring Person to holders of equity interests in such Acquiring
     Person or to any Person with whom such Acquiring Person has any continuing
     agreement, arrangement or understanding regarding the transferred


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<PAGE>   3


     Rights or (B) a transfer which the Board of Directors of the Company has
     determined is part of a plan, arrangement or understanding that has as a
     primary purpose or effect avoidance of Section 7(e) hereof, and any Rights
     Certificate issued pursuant to Section 6 or Section 11 hereof upon
     transfer, exchange, replacement or adjustment of any other Rights
     Certificate referred to in this sentence, shall contain (to the extent
     feasible) the following legend:

          The Rights represented by this Rights Certificate are or were
          beneficially owned by a Person who was or became an Acquiring Person
          or an Affiliate or Associate of an Acquiring Person (as such terms are
          defined in the Rights Agreement). Accordingly, this Rights Certificate
          and the Rights represented hereby may become null and void in the
          circumstances specified in Section 7(e) of such Agreement."

6.   Section 7(a) of the Rights Agreement is hereby amended and restated to read
     in its entirety as follows:

               "(a) Subject to Section 7(e) hereof, the registered holder of
     any Rights Certificate may exercise the Rights evidenced thereby (except as
     otherwise provided herein including, without limitation, the restrictions
     on exercisability set forth in Section 9(c), Section 11(a)(iii) and Section
     23(a) hereof) in whole or in part at any time after the Distribution Date
     upon surrender of the Rights Certificate, with the form of election to
     purchase and the certificate on the reverse side thereof duly executed, to
     the Rights Agent at the office of the Rights Agent designated for such
     purpose, together with payment of the aggregate Purchase Price with respect
     to the total number of one one-thousandths of a share (or other shares,
     securities, cash or other assets, as the case may be) as to which such
     surrendered Rights are then exercisable, at or prior to the earliest of (i)
     the Final Expiration Date, (ii) the time at which the Rights are redeemed
     as provided in Section 23 hereof (the "Redemption Date") or (iii) the time
     at which such Rights are exchanged as provided in Section 24 hereof (the
     earliest of (i), (ii) and (iii) being herein referred to as the "Expiration
     Date")."

7.   Section 11(a)(ii) of the Rights Agreement hereby amended and restated to
     read in entirety as follows:

               "(ii) Subject to Section 24 of this Agreement, in the event that
     any Person, alone or together with its Affiliates or Associates, becomes an
     Acquiring Person, then, promptly following the first occurrence of such
     event, proper provision shall be made so that each holder of a Right
     (except as provided below and in Section 7(e) hereof) shall thereafter have
     the right to receive (subject to the last sentence of Section 23(a)), upon
     exercise thereof at the then current Purchase Price in accordance with the
     terms of this Agreement, in lieu of a number of one one-thousandths of a
     share of Preferred Stock, such number of shares of Common Stock of the
     Company that equals the result obtained

                                       3

<PAGE>   4

     by (x) multiplying the then current Purchase Price by the then number of
     one one-thousandths of a share of Preferred Stock for which a Right was
     exercisable immediately prior to the first occurrence of a Section
     11(a)(ii) Event, and (y) dividing that product (which, following such first
     occurrence, shall thereafter be referred to as the "Purchase Price" for
     each Right and for all purposes of this Agreement) by 50% of the current
     market price (determined pursuant to Section 11(d) hereof) per share of
     Common Stock on the date of such first occurrence (such number of shares,
     the "Adjustment Shares")."

8.   The term "certificate of incorporation" in Section 11(a)(iii) is hereby
     amended to read: "Certificate of Incorporation".

9.   Section 13(a) of the Rights Agreement is hereby amended and restated to
     read in its entirety as follows:

               "(a) In the event that, at any time after a Person has become an
     Acquiring Person, (x) the Company shall consolidate with, or merge with and
     into, any other Person (other than a Subsidiary of the Company in a
     transaction that complies with Section 11(o) hereof), and the Company shall
     not be the continuing or surviving corporation of such consolidation or
     merger, (y) any Person (other than a Subsidiary of the Company in a
     transaction that complies with Section 11(o) hereof) shall consolidate
     with, or merge with or into, the Company, and the Company shall be the
     continuing or surviving corporation of such consolidation or merger and, in
     connection with such consolidation or merger, all or part of the
     outstanding shares of Common Stock shall be changed into or exchanged for
     stock or other securities of any other Person or cash or any other property
     or (z) the Company shall sell or otherwise transfer (or one or more of its
     Subsidiaries shall sell or otherwise transfer), in one transaction or a
     series of related transactions, assets or earning power aggregating more
     than 50% of the assets or earning power of the Company and its Subsidiaries
     (taken as a whole) to any Person or Persons (other than the Company or any
     Subsidiary of the Company in one or more transactions each of which
     complies with Section 11(o) hereof), then, and in each such case, proper
     provision shall be made so that: (i) each holder of a Right, except as
     provided in Section 7(e) hereof, shall thereafter have the right to
     receive, upon the exercise thereof at the then current Purchase Price in
     accordance with the terms of this Agreement, such number of validly
     authorized and issued, fully paid, non-assessable and freely tradeable
     shares of Common Stock of the Principal Party (as such term is hereinafter
     defined), not subject to any liens, encumbrances, rights of first refusal
     or other adverse claims, as shall be equal to the result obtained by (1)
     multiplying the then current Purchase Price by the number of one
     one-thousandths of a share of Preferred Stock for which a Right is
     exercisable immediately prior to the first occurrence of a Section 13 Event
     (or, if a Section 11(a)(ii) Event has occurred prior to the first
     occurrence of a Section 13 Event, multiplying the number of such one
     one-thousandths of a share for which a Right was exercisable immediately
     prior to the first occurrence of a Section 11(a)(ii) Event by the Purchase

                                       4

<PAGE>   5
     Price in effect immediately prior to such first occurrence), and (2)
     dividing that product (which, following the first occurrence of a Section
     13 Event, shall be referred to as the "Purchase Price" for each Right and
     for all purposes of this Agreement) by 50% of the current market price
     (determined pursuant to Section 11(d)(i) hereof) per share of the Common
     Stock of such Principal Party on the date of consummation of such Section
     13 Event; (ii) such Principal Party shall thereafter be liable for, and
     shall assume, by virtue of such Section 13 Event, all the obligations and
     duties of the Company pursuant to this Agreement; (iii) the term "Company"
     shall thereafter be deemed to refer to such Principal Party, it being
     specifically intended that the provisions of Section 11 hereof shall apply
     only to such Principal Party following the first occurrence of a Section 13
     Event; (iv) such Principal Party shall take such steps (including, but not
     limited to, the reservation of a sufficient number of shares of its Common
     Stock) in connection with the consummation of any such transaction as may
     be necessary to assure that the provisions hereof shall thereafter be
     applicable, as nearly as reasonably may be, in relation to its shares of
     Common Stock thereafter deliverable upon the exercise of the Rights; and
     (v) the provisions of Section 11(a)(ii) hereof shall be of no effect
     following the first occurrence of any Section 13 Event."

10.  Section 13(d) of the Rights Agreement is hereby deleted in its entirety.

11.  Section 23(a) of the Rights Agreement is hereby amended and restated to
     read in its entirety as follows:

               "(a) The Board of Directors of the Company may, at its option,
     at any time prior to the earlier of (i) the close of business on the tenth
     Business Day (or such later date as may be determined by the Board of
     Directors of the Company pursuant to clause (i) of the first sentence of
     Section 3(a) with respect to the Distribution Date) following the Stock
     Acquisition Date (or, if the Stock Acquisition Date shall have occurred
     prior to the Record Date, the close of business on the tenth Business Day
     following the Record Date) or (ii) the Final Expiration Date, redeem all
     but not less than all the then outstanding Rights at a redemption price of
     $.01 per Right, as such amount may be appropriately adjusted to reflect any
     stock split, stock dividend or similar transaction occurring after the date
     hereof (such redemption price being hereinafter referred to as the
     "Redemption Price"). The redemption of the Rights by the Board may be made
     effective at such time, on such basis and with such conditions as the Board
     of Directors in its sole discretion may establish. Notwithstanding anything
     contained in this Agreement to the contrary, the Rights shall not be
     exercisable after the first occurrence of a Section 11(a)(ii) Event until
     such time as the Company's right of redemption hereunder has expired."

12.  Section 23(c) of the Rights Agreement is hereby amended and restated to
     read in its entirety as follows:

                                       5

<PAGE>   6



               "(c) In the event of a redemption of the Rights in accordance
     with this Agreement, the Company may, at its option, discharge all of its
     obligations with respect to the Rights by (i) issuing a press release
     announcing the manner of redemption of the Rights in accordance with this
     Agreement and (ii) mailing payment of the Redemption Price to the
     registered holders of the Rights at their last addresses as they appear on
     the registry books of the Rights Agent or, prior to the Distribution Date,
     on the registry books of the Transfer Agent of the Common Shares, and upon
     such action, all outstanding Rights and Right Certificates shall be null
     and void without any further action by the Company."

13.  The address for notices to or demands on the Rights Agent set forth in
     Section 26 of the Rights Agreement is hereby amended to read as follows:

     "BankBoston, N.A.
     c/o EquiServe Limited Partnership
     150 Royall Street
     Canton, MA  02021
     Attention:  Client Administration"

14.  Section 27 of the Rights Agreement is hereby amended and restated to read
     in its entirety as follows:

                "Section 27. SUPPLEMENTS AND AMENDMENTS. Except as provided in
     the penultimate sentence of this Section 27, for so long as the Rights are
     then redeemable, the Company may, in its sole and absolute discretion, and
     the Rights Agent shall, if the Company so directs, supplement or amend any
     provision of this Agreement in any respect without the approval of any
     holders of the Rights. At any time when the Rights are no longer
     redeemable, except as provided in the penultimate sentence of this Section
     27, the Company may, and the Rights Agent shall, if the Company so directs,
     supplement or amend this Agreement without the approval of any holders of
     Rights in order (i) to cure any ambiguity or (ii) to correct or supplement
     any provision contained herein which may be defective or inconsistent with
     any other provisions herein; PROVIDED, that no such supplement or amendment
     shall adversely affect the interests of the holders of Rights as such
     (other than an Acquiring Person or an Affiliate or Associate of an
     Acquiring Person). Upon the delivery of a certificate from an appropriate
     officer of the Company which states that the proposed supplement or
     amendment is in compliance with the terms of this Section 27, the Rights
     Agent shall execute such supplement or amendment. Notwithstanding anything
     contained in this Agreement to the contrary, no supplement or amendment
     shall be made which changes the Redemption Price or the Final Expiration
     Date. Prior to the Distribution Date, the interests of the holders of
     Rights shall be deemed coincident with the interests of the holders of
     Common Stock."

                                       6

<PAGE>   7


15.  Section 31 of the Rights Agreement is hereby amended and restated to read
     in its entirety as follows:

                "Section 31. SEVERABILITY. If any term, provision, covenant or
     restriction of this Agreement is held by a court of competent jurisdiction
     or other authority to be invalid, void or unenforceable, the remainder of
     the terms, provisions, covenants and restrictions of this Agreement shall
     remain in full force and effect and shall in no way be affected, impaired
     or invalidated; provided, however, that notwithstanding anything in this
     Agreement to the contrary, if any such term, provision, covenant or
     restriction is held by such court or authority to be invalid, void or
     unenforceable and the Board determines in its good faith judgment that
     severing the invalid, void or unenforceable language from this Agreement
     would adversely affect the purpose or effect of this Agreement, the right
     of redemption set forth in Section 23 hereof shall be reinstated and shall
     not expire until the close of business on the tenth day following the date
     of such determination by the Board of Directors of the Company."

16.  Except as amended hereby, the Rights Agreement shall remain unchanged and
     shall remain in full force and effect.

17.  This Amendment may be executed in any number of counterparts, each of which
     shall be an original, but all of which together shall constitute one
     instrument.

     IN WITNESS WHEREOF, the parties have caused this Amendment to be executed
by their respective duly authorized representatives as of the date first above
written.

                                          IDEXX LABORATORIES, INC.

                                          By: /s/ David E. Shaw
                                              ------------------------------
                                              Name:  David E. Shaw
                                              Title: President and Chief
                                                     Executive Officer


                                          BANKBOSTON, N.A.

                                          By: /s/ Katherine Anderson
                                              ------------------------------
                                              Name: Katherine Anderson
                                              Title: Managing Director





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